Educate me about... wedge pulleys

  1. skotl

    skotl Forum Supporter

    Messages:
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    Location:
    Edinburgh, UK
    VFD bought.
    3 phase motor bought.
    Switches bought.
    Wired together on the kitchen table and successfully pushing air around in circles :thumbup:

    Now I need to get it on the lathe. I just bought some replacement SPA belts (SPA1557) and these fit the lathe head pulleys and the existing single phase motor's pulleys.

    But the shaft on the outgoing motor is 19mm and the shaft on the new motor is 24mm, so I need new twin pulleys for the new motor. Turns out there are as many acronyms and widgets in pulleys as there are in brain surgery...

    So looking at bearingboys, I think I need one of these (three grooves - they don't seem to have a twin groove):

    upload_2020-11-21_0-55-16.png


    And then it seems that I need to sort out this "taperlock" thing... So it's a 2517, and I reckon I need a "2517-24" bush to fit the 24mm shaft?


    upload_2020-11-21_0-56-53.png


    Is that correct?
     
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  2. gordon stephenson

    gordon stephenson Forum Supporter

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    Taper locks are great,
     
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  3. skotl

    skotl Forum Supporter

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    A commendation :) did my random googlings look right for a 24mm shaft?
     
  4. skotl

    skotl Forum Supporter

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    Edinburgh, UK
    Aha! Youtube to the rescue... so I think I'm on the right track!

     
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  5. metalmelt Member

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    589
    Location:
    UK
    Taperlock are brilliant as they give you flexibility if the motor shaft is worn as they can take up slightly more slack.
     
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  6. Wallace

    Wallace Member

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    @skotl Your selection looks correct to me, if you are in doubt give them a ring.
     
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  7. Pete.

    Pete. Member

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    9,809
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    Are you sure you need a 6" pulley on the motor?
     
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  8. mike os

    mike os just a little insane.....

    Messages:
    6,960
    Location:
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    You are correct select pulley on ways and diameter then bush to fit the pulley number and shaft size.
     
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  9. Brad93

    Brad93 M J B Engineering

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    10,375
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    Why not bore out the existing pulley?
     
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  10. 8ob

    8ob Forum Supporter

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    Taperlock`s are not very fatfinger tolerant ,the centres are made of cast iron.Worth cleaning up the shaft/keyway etc so it slips on without the need of a large portion of a tapometer.

    Bob
     
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  11. Wallace

    Wallace Member

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    7,511
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    Staines, Middlesex, England.
    Top Tip that. :thumbup:
     
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  12. James1979 Forum Supporter

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    Too much tappage and they crack. Not much can be too much!
     
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  13. MattF

    MattF Member

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    First time I've heard a hammer & brute force referred to in that manner. :D
     
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  14. timgunn1962 Member

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    Lancashire UK
  15. Spark plug

    Spark plug Member

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    Durham, England
    Another tip, when fitting a taper lock with the holes facing away from you and little room between the pulley and motor or gearbox, don’t screw the setscrews in with your fingers backwards to the point of no return.

    I was called by another engineer to assist with this situation once, we had to cut the sprocket off, from then on he was known as taperlock.
     
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  16. 8ob

    8ob Forum Supporter

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    If you do need to bring in persuadious make sure its the small one .

    [​IMG]

    big hammer.jpg
    [​IMG]
     
    • red cross.png
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  17. James1979 Forum Supporter

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    If you clean and de burr shaft and key they usual go on without much of a fight. Usual problem I have on machines is the length of shaft (quiet at the back! :D) isn’t enough to get it on ‘properly’. You sort of have to pre assemble it loosely and juggle it all on.
     
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  18. mike os

    mike os just a little insane.....

    Messages:
    6,960
    Location:
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    If you need a hammer on taperloc you need to clean the shaft or get the right size
     
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  19. awemawson Forum Supporter

    When you fit a taper lock be careful with the fit of the key. If it is at all tight in the radial direction the inner bit of the taper lock is stressed over it and will crack as you tighten the Allen screws that hold it all together. Although the key needs to be a good fit in the key way it needs about ten thou ‘headroom’ radially.

    I first discovered this when I dismantled my 6 foot field flail for rebuilding but have come across it several times since.
     
  20. Kram

    Kram Member

    Messages:
    1,781
    Location:
    Sussex
    He wont need a tapper its a new motor.
    Yes those will work great.
    That taper lock takes 8mm wide 3mm high key.
    My motor came with 8mm square key and I needed 8x5mm to fit the taperlock, but I was using the baby size 1108 near its maximum, 28mm shaft. 2517's are massive in comparison.

    What ratio are you going for? Is double pulley just to spread the load or to give extra speeds.
    Id say a single belt is more than adequate but wont do any harm..
     
    skotl likes this.
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